Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method of wireless communication comprising: receiving an uplink grant that schedules data during an uplink resource allocation comprising a two-symbol transmission time interval (TTI), the uplink grant comprising an indication of a number of symbol periods between one symbol of the TTI scheduled for a demodulation reference signal (DM-RS) and a subsequent two-symbol TTI scheduled for data; determining, based at least in part on the uplink grant that schedules the data, that the DM-RS is scheduled to be transmitted in the one symbol of the two-symbol TTI; and transmitting the DM-RS in the one symbol of the two-symbol TTI and data in the subsequent two-symbol TTI according to the uplink grant.
2. The method of claim 1 , wherein the subsequent two-symbol TTI excludes another DM-RS.
A method for wireless communication involves transmitting data using a two-symbol transmission time interval (TTI) in a wireless network. The method addresses the challenge of efficiently transmitting data while minimizing overhead and resource usage. The two-symbol TTI is used for transmitting data symbols, and a demodulation reference signal (DM-RS) is included within this TTI to assist in demodulating the transmitted data. The subsequent two-symbol TTI excludes another DM-RS, reducing the number of reference signals transmitted and conserving resources. This approach optimizes the use of wireless resources by balancing the need for accurate demodulation with the goal of minimizing overhead. The method ensures reliable data transmission while improving spectral efficiency by avoiding redundant DM-RS transmissions in consecutive TTIs. The technique is particularly useful in high-speed wireless communication systems where efficient resource allocation is critical.
3. The method of claim 1 , wherein the number of symbol periods between the one symbol scheduled for the DM-RS and the subsequent two-symbol TTI comprises an odd number.
This invention relates to wireless communication systems, specifically to the scheduling of demodulation reference signals (DM-RS) and transmission time intervals (TTI) in orthogonal frequency-division multiplexing (OFDM) systems. The problem addressed is optimizing the placement of DM-RS symbols relative to data transmission intervals to improve channel estimation accuracy and reduce overhead in short TTI transmissions. The method involves scheduling a DM-RS symbol within a transmission frame and ensuring that the number of symbol periods between the DM-RS symbol and the subsequent two-symbol TTI is an odd number. This spacing helps mitigate interference and improves channel tracking by ensuring that the DM-RS is positioned asymmetrically relative to the TTI, which enhances the system's ability to estimate and compensate for channel variations. The technique is particularly useful in high-mobility scenarios or environments with rapid channel changes, where precise channel estimation is critical for reliable data demodulation. The method may be applied in various wireless communication standards, including 5G and beyond, where short TTIs and flexible DM-RS placement are required to support low-latency applications. By using an odd-numbered spacing, the system avoids periodic interference patterns that could degrade performance, while maintaining efficient use of available resources. The approach can be combined with other channel estimation techniques to further enhance reliability in dynamic wireless channels.
4. The method of claim 1 , wherein the transmitting comprises: transmitting data in a second symbol of the two-symbol TTI.
A method for wireless communication involves transmitting data in a two-symbol transmission time interval (TTI) to improve latency and efficiency in high-speed networks. The method addresses the challenge of reducing transmission delays in wireless systems by utilizing ultra-short TTIs, which are critical for applications requiring low-latency communication, such as real-time control, autonomous systems, and ultra-reliable low-latency communication (URLLC). The method includes transmitting data in a second symbol of the two-symbol TTI, following an initial transmission in a first symbol. This approach allows for efficient use of available transmission resources while maintaining synchronization and minimizing overhead. The method may also include adjusting transmission parameters, such as modulation and coding schemes, to optimize performance based on channel conditions. By leveraging two-symbol TTIs, the method enables faster data delivery and improved spectral efficiency, making it suitable for next-generation wireless networks. The technique is particularly useful in scenarios where rapid data exchange is essential, such as in industrial automation, vehicular communications, and mission-critical applications. The method ensures reliable data transmission while adhering to strict latency constraints, enhancing overall system performance.
5. The method of claim 1 , wherein the uplink grant is received in a downlink control channel in a two-symbol TTI that precedes the TTI scheduled for the DM-RS.
In wireless communication systems, particularly in 5G and beyond, efficient scheduling and resource allocation are critical for supporting low-latency applications. A key challenge is ensuring that user equipment (UE) can transmit uplink data reliably while minimizing overhead and latency. One approach involves using downlink control channels to convey uplink grants, which allocate resources for uplink transmissions. However, traditional methods may not provide sufficient flexibility or speed for emerging use cases requiring ultra-reliable low-latency communication (URLLC). This invention addresses the problem by optimizing the timing and structure of uplink grants in a wireless communication system. Specifically, it involves receiving an uplink grant in a downlink control channel within a two-symbol transmission time interval (TTI) that precedes the TTI scheduled for the demodulation reference signal (DM-RS). The DM-RS is a reference signal used by the receiver to demodulate the uplink data transmission. By scheduling the uplink grant in a shorter TTI (two symbols) before the TTI containing the DM-RS, the system reduces latency and improves scheduling efficiency. This allows the UE to prepare for uplink transmission more quickly, supporting faster and more reliable communication. The method may also include additional steps such as transmitting the DM-RS in the scheduled TTI and using the DM-RS to demodulate the uplink data. The approach is particularly useful in scenarios where rapid resource allocation and low-latency communication are required, such as in URLLC applications.
6. The method of claim 1 , wherein the uplink grant is received in a downlink control channel during a TTI that has a longer duration than the two-symbol TTI.
This invention relates to wireless communication systems, specifically methods for handling uplink grants in scenarios involving variable transmission time intervals (TTIs). The problem addressed is the efficient management of uplink transmissions when different TTI durations are used, particularly when a longer TTI is employed for control signaling while shorter TTIs (e.g., two-symbol TTIs) are used for data transmission. The invention describes a method where an uplink grant is received in a downlink control channel during a TTI that has a longer duration than the two-symbol TTI. This allows the system to coordinate uplink transmissions more effectively by leveraging the longer TTI for control information while maintaining the flexibility of shorter TTIs for data. The method ensures proper synchronization and resource allocation between the longer and shorter TTIs, improving overall system efficiency and reducing latency. The invention is particularly useful in advanced wireless networks where dynamic TTI switching is employed to balance control signaling overhead and data transmission efficiency.
7. The method of claim 1 , wherein the two-symbol TTI comprises the smallest scheduling unit for communications between a user equipment (UE) and a base station.
This invention relates to wireless communication systems, specifically to the scheduling of transmissions between a user equipment (UE) and a base station. The problem addressed is optimizing the scheduling granularity to reduce latency and improve efficiency in communication protocols. The invention describes a method where a two-symbol transmission time interval (TTI) is used as the smallest scheduling unit for communications between a UE and a base station. This two-symbol TTI allows for faster scheduling decisions compared to longer TTIs, enabling quicker data transmission and reception. The method involves dynamically assigning resources within this two-symbol interval to support low-latency applications, such as real-time services or ultra-reliable low-latency communication (URLLC). The two-symbol TTI is designed to be the smallest possible scheduling unit, meaning no smaller interval is used for scheduling. This ensures minimal delay while maintaining synchronization and resource allocation efficiency. The method may also include techniques for handling control signaling, data transmission, and acknowledgment feedback within this constrained timeframe. By using such a short TTI, the system can support faster response times and more efficient use of radio resources, particularly in scenarios requiring rapid data exchange. The invention may also integrate with other scheduling mechanisms to ensure compatibility with existing communication protocols while enhancing performance.
8. The method of claim 1 , wherein the one symbol of the two-symbol TTI comprises DM-RS transmissions from two or more user equipments (UEs).
This invention relates to wireless communication systems, specifically to techniques for reducing transmission time intervals (TTI) in uplink communications. The problem addressed is the inefficiency in resource allocation when multiple user equipments (UEs) transmit data within the same TTI, leading to increased latency and reduced spectral efficiency. The method involves using a two-symbol TTI structure, where one of the symbols is dedicated to demodulation reference signal (DM-RS) transmissions from two or more UEs. The DM-RS transmissions from these UEs are multiplexed within the same symbol, allowing for simultaneous channel estimation and data demodulation. This approach enables efficient resource utilization by sharing the DM-RS symbol among multiple UEs, reducing overhead and improving overall system throughput. The method further includes transmitting data from the UEs in the remaining symbol of the TTI. The data transmissions are synchronized to ensure proper demodulation at the receiver. The receiver processes the multiplexed DM-RS signals to estimate the channel conditions for each UE, enabling accurate data detection. This technique is particularly useful in scenarios where multiple UEs need to transmit data in a short time frame, such as in ultra-reliable low-latency communication (URLLC) applications. By multiplexing DM-RS transmissions from multiple UEs within a single symbol, the method reduces the number of required symbols for control signaling, thereby minimizing latency and improving spectral efficiency. The approach is compatible with existing wireless communication standards and can be implemented in both time-division duplex (TDD) and frequency-division duplex (FDD) systems.
9. A method of wireless communication comprising: transmitting an uplink grant that schedules data during an uplink resource allocation comprising a two-symbol transmission time interval (TTI), the uplink grant indicating that a demodulation reference signal (DM-RS) is scheduled to be transmitted in one symbol of the two-symbol TTI and comprising an indication of a number of symbol periods between the one symbol scheduled for the DM-RS and a subsequent two-symbol TTI scheduled for data; determining that a DM-RS is scheduled to be transmitted in the one symbol of the two-symbol TTI; and receiving the DM-RS in the one symbol of the two-symbol TTI based at least in part on the determination that the DM-RS is scheduled and data in the subsequent two-symbol TTI based at least in part on the number of symbol periods indicated in the uplink grant.
This invention relates to wireless communication systems, specifically methods for efficient uplink scheduling and demodulation reference signal (DM-RS) transmission in short transmission time intervals (TTIs). The problem addressed is optimizing resource allocation and signal processing in scenarios where data and DM-RS are transmitted in very short time slots, such as two-symbol TTIs, to improve spectral efficiency and reduce latency. The method involves transmitting an uplink grant that schedules data transmission during a two-symbol TTI. The grant specifies that a DM-RS will be transmitted in one of the two symbols and includes an indication of the number of symbol periods between the DM-RS symbol and a subsequent two-symbol TTI allocated for data. The system then determines that the DM-RS is scheduled in the designated symbol of the TTI and receives the DM-RS in that symbol. Data is subsequently received in the next two-symbol TTI, with timing based on the symbol period indication provided in the uplink grant. This approach allows for precise scheduling of DM-RS and data transmissions in ultra-short TTIs, enabling efficient channel estimation and data decoding while minimizing overhead. The method ensures proper synchronization between the transmitter and receiver, even in high-speed communication scenarios where rapid resource allocation is critical.
10. The method of claim 9 , wherein the subsequent two-symbol TTI excludes another DM-RS.
A system and method for wireless communication involves transmitting data symbols and demodulation reference signals (DM-RS) in a time division duplex (TDD) or frequency division duplex (FDD) system. The method includes transmitting a first data symbol in a first time slot, followed by a first DM-RS in a second time slot, and then a second data symbol in a third time slot. The second data symbol is transmitted using a two-symbol transmission time interval (TTI). The subsequent two-symbol TTI excludes another DM-RS, meaning no additional DM-RS is transmitted in the following two-symbol interval. This approach optimizes resource allocation by reducing the overhead of DM-RS transmissions while maintaining reliable demodulation of data symbols. The method is applicable in wireless communication systems where efficient use of time-frequency resources is critical, such as 5G or beyond-5G networks. The exclusion of an additional DM-RS in the subsequent two-symbol TTI helps improve spectral efficiency by allowing more data symbols to be transmitted without compromising channel estimation accuracy. The system may include a transmitter configured to generate and transmit the data symbols and DM-RS according to the specified timing structure.
11. The method of claim 9 , wherein the receiving comprises: receiving data in a second symbol of the two-symbol TTI.
A method for wireless communication involves transmitting and receiving data in a two-symbol transmission time interval (TTI) to improve latency and efficiency in high-speed wireless networks. The method addresses the challenge of reducing transmission delays in systems with strict latency requirements, such as 5G and beyond. The two-symbol TTI structure allows for faster data processing and transmission compared to traditional longer TTIs. The method includes receiving data in a second symbol of the two-symbol TTI, where the first symbol is used for control information or other data. This approach optimizes resource allocation and ensures timely data delivery. The method may also involve transmitting data in the first symbol, where the first symbol is used for control signaling or other critical information. The two-symbol TTI structure enables flexible scheduling and efficient use of wireless resources, improving overall system performance. The method is particularly useful in scenarios requiring low-latency communication, such as real-time applications, autonomous systems, and industrial automation. By dividing the TTI into two symbols, the method ensures that both control and data transmissions are handled efficiently, reducing delays and improving reliability.
12. The method of claim 9 , wherein the receiving comprises: receiving the DM-RS in a leading symbol of the two-symbol TTI, wherein the DM-RS is associated with a first user equipment (UE); and receiving another DM-RS in the leading symbol of the two-symbol TTI, wherein the other DM-RS is associated with a second UE.
This invention relates to wireless communication systems, specifically to methods for receiving demodulation reference signals (DM-RS) in short transmission time intervals (TTIs) to support multiple user equipment (UE) devices. The problem addressed is efficient DM-RS reception in ultra-short TTIs, such as two-symbol TTIs, where limited time resources must accommodate both data and reference signals for multiple UEs. The method involves receiving DM-RS in the leading symbol of a two-symbol TTI. The DM-RS is associated with a first UE, enabling the network to demodulate data transmitted to that UE. Additionally, another DM-RS is received in the same leading symbol of the TTI, associated with a second UE. This allows simultaneous DM-RS transmission for multiple UEs within the same symbol, improving spectral efficiency and reducing latency. The approach leverages multiplexing techniques to share the limited time resources of the short TTI, ensuring reliable demodulation for multiple UEs without increasing the TTI duration. This is particularly useful in high-speed or low-latency applications where short TTIs are critical.
13. The method of claim 12 , further comprising: receiving data from the second UE in a second symbol of the two-symbol TTI, wherein the subsequent two-symbol TTI that excludes another DM-RS.
This invention relates to wireless communication systems, specifically methods for improving data transmission efficiency in short transmission time intervals (TTIs) without dedicated demodulation reference signals (DM-RS). The problem addressed is the need to reduce overhead in ultra-reliable low-latency communication (URLLC) scenarios while maintaining reliable data detection. Traditional TTIs with DM-RS consume valuable resources, limiting throughput. The solution involves a two-symbol TTI structure where data is transmitted in both symbols, but only one symbol includes a DM-RS. Subsequent TTIs exclude DM-RS entirely, relying on channel estimation from the initial TTI. The method includes receiving data from a second user equipment (UE) in the second symbol of the two-symbol TTI, enabling efficient multi-UE scheduling. By omitting DM-RS in subsequent TTIs, the system reduces overhead while maintaining signal integrity through predictive channel tracking. This approach is particularly useful in 5G and beyond networks where latency and reliability are critical. The technique leverages temporal correlation of wireless channels to minimize reference signal usage without degrading performance.
14. An apparatus for wireless communication, comprising: a processor; memory in electronic communication with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: receive an uplink grant that schedules data during an uplink resource allocation comprising a two-symbol transmission time interval (TTI), the uplink grant comprising an indication of a number of symbol periods between one symbol of the TTI scheduled for a demodulation reference signal (DM-RS) and a subsequent two-symbol TTI scheduled for data; determine, based at least in part on the uplink grant that schedules the data, that the DM-RS is scheduled to be transmitted in the one symbol of the two-symbol TTI; and transmit the DM-RS in the one symbol of the two-symbol TTI and data in the subsequent two-symbol TTI according to the uplink grant.
The invention relates to wireless communication systems, specifically addressing efficient scheduling and transmission of data and demodulation reference signals (DM-RS) in short transmission time intervals (TTIs). In wireless networks, particularly those using short TTIs, optimizing resource allocation and minimizing overhead is critical for improving spectral efficiency and reducing latency. The invention provides an apparatus for wireless communication that includes a processor, memory, and instructions to manage uplink transmissions in a two-symbol TTI framework. The apparatus receives an uplink grant that schedules data transmission over a two-symbol TTI, with the grant indicating the number of symbol periods between a DM-RS symbol and a subsequent two-symbol TTI for data. The apparatus determines, based on the uplink grant, that a DM-RS is scheduled in one symbol of the two-symbol TTI and transmits the DM-RS in that symbol while transmitting data in the subsequent two-symbol TTI. This approach ensures proper synchronization and demodulation of data by leveraging the DM-RS in a compact time frame, enhancing efficiency in short-TTI communications. The invention improves resource utilization by dynamically scheduling DM-RS and data transmissions according to the uplink grant, reducing overhead and latency in wireless communication systems.
15. The apparatus of claim 14 , wherein the subsequent two-symbol TTI excludes another DM-RS.
A system for wireless communication includes a transmitter configured to send data using a two-symbol transmission time interval (TTI) in a subframe. The transmitter employs a demodulation reference signal (DM-RS) within the TTI to assist in channel estimation and data demodulation. The system is designed to optimize resource allocation by excluding a second DM-RS in a subsequent two-symbol TTI, reducing overhead while maintaining reliable communication. The transmitter may adjust the TTI duration dynamically based on channel conditions or data requirements, ensuring efficient use of available bandwidth. The system may also include a receiver configured to process the transmitted data, using the DM-RS for accurate demodulation despite the absence of a second DM-RS in the subsequent TTI. This approach enhances spectral efficiency by minimizing reference signal overhead while preserving signal integrity. The system may operate in various wireless communication standards, such as 5G or beyond, where flexible TTI configurations are critical for supporting diverse services with varying latency and throughput demands. The exclusion of the second DM-RS in the subsequent TTI helps reduce signaling overhead, allowing more resources for data transmission, particularly in scenarios where channel conditions are stable or predictable. The transmitter may further include error correction mechanisms to compensate for the reduced reference signaling, ensuring robust communication performance.
16. The apparatus of claim 14 , wherein the number of symbol periods between the one symbol scheduled for the DM-RS and the subsequent two-symbol TTI comprises an odd number.
This invention relates to wireless communication systems, specifically to apparatuses for scheduling demodulation reference signals (DM-RS) and transmission time intervals (TTI) in a manner that improves signal integrity and reduces interference. The problem addressed is the need for efficient DM-RS placement to ensure accurate channel estimation while minimizing overhead and maintaining synchronization in short TTIs, particularly in systems with high mobility or dense deployments. The apparatus includes a scheduler configured to allocate a DM-RS within a transmission frame, followed by a two-symbol TTI. The key innovation is that the number of symbol periods between the DM-RS and the subsequent TTI is an odd number. This spacing helps mitigate interference between the DM-RS and data symbols, ensuring reliable channel estimation without degrading data transmission performance. The odd-numbered spacing may be dynamically adjusted based on channel conditions, user equipment (UE) mobility, or network load to optimize performance. The apparatus may also include a transmitter for sending the scheduled DM-RS and TTI to a UE, and a receiver for monitoring feedback to refine scheduling decisions. The odd-numbered spacing is particularly useful in scenarios where rapid channel variations occur, such as in millimeter-wave or high-frequency communications, where precise timing and interference management are critical. The solution enhances spectral efficiency and reliability in next-generation wireless networks.
17. The apparatus of claim 14 , wherein the instructions executable by the processor to cause the apparatus to transmit the DM-RS and data are executable by the processor to cause the apparatus to: transmit the data in a second symbol of the two-symbol TTI.
In wireless communication systems, efficient transmission of data and reference signals is critical for reliable communication. A key challenge is optimizing the use of limited time-frequency resources while maintaining signal integrity. This invention addresses this by improving the transmission of demodulation reference signals (DM-RS) and data within a two-symbol transmission time interval (TTI). The apparatus includes a processor and memory storing instructions that, when executed, enable the apparatus to transmit DM-RS and data in a two-symbol TTI. Specifically, the apparatus transmits the data in the second symbol of the TTI, while the DM-RS is transmitted in the first symbol. This arrangement allows for efficient use of the TTI, ensuring that both the reference signals and data are transmitted within the constrained time frame. The DM-RS aids in channel estimation, enabling the receiver to accurately demodulate the data. By structuring the transmission in this manner, the invention enhances spectral efficiency and reduces latency, particularly in high-speed communication scenarios where rapid data transmission is essential. The apparatus may also include additional features, such as configuring the DM-RS based on channel conditions or adjusting transmission parameters to optimize performance. This approach is particularly useful in 5G and beyond-5G networks, where low-latency and high-reliability communication are critical.
18. The apparatus of claim 14 , wherein the uplink grant is received in a downlink control channel in a two-symbol TTI that precedes the TTI scheduled for the DM-RS.
In wireless communication systems, particularly in 5G and beyond, efficient uplink scheduling and demodulation reference signal (DM-RS) transmission are critical for low-latency communication. A key challenge is ensuring timely uplink grants to support rapid data transmission while maintaining reliable channel estimation through DM-RS. This invention addresses this by optimizing the timing and placement of uplink grants relative to DM-RS transmission. The apparatus includes a transceiver configured to receive an uplink grant in a downlink control channel. The uplink grant is transmitted in a two-symbol transmission time interval (TTI) that precedes the TTI scheduled for the DM-RS. This early grant allows the user equipment (UE) to prepare for uplink transmission with minimal delay, while the DM-RS is transmitted in a subsequent TTI to enable accurate channel estimation. The apparatus further includes a processor to decode the uplink grant and configure the transceiver for uplink transmission based on the grant. The two-symbol TTI for the downlink control channel ensures low-latency scheduling, while the separate TTI for DM-RS ensures reliable channel tracking. This approach enhances spectral efficiency and reduces latency in high-speed wireless networks.
19. The apparatus of claim 14 , wherein the uplink grant is received in a downlink control channel in a TTI that has a longer duration than the two-symbol TTI.
This invention relates to wireless communication systems, specifically improving uplink scheduling efficiency in scenarios where short transmission time intervals (TTIs) are used. The problem addressed is the inefficiency in uplink grant signaling when using very short TTIs, such as two-symbol TTIs, which can lead to delays or resource underutilization due to the limited time available for downlink control signaling. The apparatus includes a wireless communication device configured to receive an uplink grant in a downlink control channel. The uplink grant is transmitted in a TTI that has a longer duration than the two-symbol TTI, allowing sufficient time for the downlink control channel to be processed and for the uplink transmission to be scheduled in the subsequent short TTI. This approach ensures that the uplink grant can be reliably received and processed before the short TTI begins, avoiding delays or wasted resources. The apparatus may also include components for monitoring the downlink control channel, decoding the uplink grant, and transmitting data in the allocated uplink resources within the short TTI. The longer TTI for the downlink control channel provides flexibility in scheduling while maintaining low-latency communication for the uplink data transmission. This method is particularly useful in scenarios requiring ultra-reliable low-latency communication (URLLC) or other time-sensitive applications.
20. The apparatus of claim 14 , wherein the one symbol of the two-symbol TTI comprises DM-RS transmissions from two or more user equipments (UEs).
This invention relates to wireless communication systems, specifically improving data transmission efficiency in scenarios involving multiple user equipments (UEs). The problem addressed is the need for more flexible and efficient transmission time interval (TTI) configurations, particularly when multiple UEs share communication resources. The apparatus includes a transmitter configured to send data using a two-symbol TTI, where one of the symbols carries demodulation reference signals (DM-RS) from two or more UEs. This allows multiple UEs to share the same TTI symbol for reference signal transmission, reducing overhead and improving spectral efficiency. The DM-RS transmissions from different UEs are multiplexed within the same symbol, enabling the receiver to distinguish and decode signals from each UE. The apparatus may also include a receiver to process these multiplexed DM-RS transmissions, extracting data from multiple UEs within a single TTI. This approach is particularly useful in dense wireless networks where resource allocation must be optimized to support many devices simultaneously. The invention enhances system capacity and reduces latency by efficiently utilizing available transmission resources.
21. An apparatus for wireless communication, comprising: a processor; memory in electronic communication with the processor; and instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to: transmit an uplink grant that schedules data during an uplink resource allocation comprising a two-symbol transmission time interval (TTI), the uplink grant indicating that a demodulation reference signal (DM-RS) is scheduled to be transmitted in one symbol of the two-symbol TTI and comprising an indication of a number of symbol periods between the one symbol scheduled for the DM-RS and a subsequent two-symbol TTI scheduled for data; determine that a DM-RS is scheduled to be transmitted in the one symbol of the two-symbol TTI; and receive the DM-RS in the one symbol of the two-symbol TTI based at least in part on the determination that the DM-RS is scheduled and data in the subsequent two-symbol TTI based at least in part on the number of symbol periods indicated in the uplink grant.
This invention relates to wireless communication systems, specifically improving data transmission efficiency in short transmission time intervals (TTIs). The problem addressed is the need for efficient scheduling and reception of demodulation reference signals (DM-RS) in ultra-low-latency communication scenarios where data is transmitted in very short time intervals, such as two-symbol TTIs. Traditional methods may not optimize the placement of DM-RS within these short intervals, leading to inefficiencies in channel estimation and data decoding. The apparatus includes a processor and memory storing instructions that, when executed, enable the apparatus to transmit an uplink grant scheduling data in a two-symbol TTI. The grant specifies that a DM-RS is transmitted in one of the two symbols and includes an indication of the number of symbol periods between the DM-RS symbol and a subsequent two-symbol TTI for data. The apparatus then determines the DM-RS is scheduled in the specified symbol and receives the DM-RS and subsequent data based on the indicated symbol period gap. This approach ensures precise timing alignment between the DM-RS and data, improving channel estimation accuracy and reducing latency in ultra-short TTI communications. The system optimizes resource allocation by dynamically adjusting the placement of DM-RS within the TTI structure, enhancing overall transmission efficiency.
22. The apparatus of claim 21 , wherein the subsequent two-symbol TTI excludes another DM-RS.
The invention relates to wireless communication systems, specifically to apparatuses and methods for transmitting and receiving data in a wireless network. The problem addressed is the efficient use of resources in wireless communication, particularly in managing the transmission time intervals (TTIs) and demodulation reference signals (DM-RS) to improve data transmission reliability and reduce overhead. The apparatus includes a transmitter configured to transmit data symbols and DM-RS symbols within a TTI. The TTI is divided into multiple symbol periods, and the transmitter is configured to transmit a DM-RS symbol in a first symbol period of the TTI. The transmitter then transmits data symbols in subsequent symbol periods of the TTI. The apparatus also includes a receiver configured to receive the data symbols and DM-RS symbols and to demodulate the received data symbols using the DM-RS symbols. In one embodiment, the apparatus is configured to exclude a DM-RS symbol from a subsequent two-symbol TTI. This means that after the initial TTI where a DM-RS is transmitted, the next TTI, which consists of two symbol periods, does not include a DM-RS. This exclusion reduces the overhead of DM-RS transmission, allowing more resources to be allocated to data transmission, thereby improving spectral efficiency. The receiver is configured to demodulate the data symbols in the subsequent two-symbol TTI using the DM-RS from the previous TTI, ensuring reliable data reception without the need for a DM-RS in every TTI. This approach is particularly useful in scenarios where channel conditions are stable, and the DM-RS from the previous TTI can be reliably used for demodulation.
23. The apparatus of claim 21 , wherein the instructions executable by the processor to cause the apparatus to receive the DM-RS and data are executable by the processor to cause the apparatus to: receive the data during a second symbol of the two-symbol TTI.
This invention relates to wireless communication systems, specifically improving data transmission efficiency in short transmission time intervals (TTIs). The problem addressed is the need to optimize the reception of demodulation reference signals (DM-RS) and data within a two-symbol TTI, ensuring reliable demodulation while maximizing data throughput. The apparatus includes a processor and instructions executable by the processor to receive both DM-RS and data during a two-symbol TTI. The DM-RS is used for channel estimation to demodulate the data. The apparatus is configured to receive the data specifically during the second symbol of the two-symbol TTI. This timing ensures that the DM-RS, which is received in the first symbol, can be used to accurately estimate the channel conditions before the data is processed. By separating the DM-RS and data into distinct symbols, the system avoids interference and improves demodulation accuracy. The apparatus may also include additional components, such as a transceiver for wireless communication and memory for storing the received data and DM-RS. The overall design enhances spectral efficiency and reliability in short-duration transmissions, which is critical for low-latency applications in wireless networks.
24. The apparatus of claim 21 , wherein the instructions executable by the processor to cause the apparatus to receive the DM-RS and data are executable by the processor to cause the apparatus to: receive the DM-RS in a leading symbol of the two-symbol TTI, wherein the DM-RS is associated with a first user equipment (UE); and receive another DM-RS in the leading symbol of the two-symbol TTI, wherein the other DM-RS is associated with a second UE.
This invention relates to wireless communication systems, specifically improving data transmission efficiency in short transmission time intervals (TTIs) by multiplexing demodulation reference signals (DM-RS) for multiple user equipment (UE) devices. The problem addressed is the need to support multiple UEs in ultra-short TTIs, such as two-symbol TTIs, while maintaining reliable channel estimation and data demodulation. The apparatus includes a processor configured to execute instructions for receiving DM-RS and data in a two-symbol TTI. The processor receives a first DM-RS in the leading symbol of the TTI, which is associated with a first UE. Simultaneously, the processor receives a second DM-RS in the same leading symbol, associated with a second UE. This multiplexing allows multiple UEs to share the same time-frequency resources for reference signals, increasing spectral efficiency without sacrificing channel estimation accuracy. The data for each UE is then received in the subsequent symbol of the TTI, with the DM-RS used for demodulation. This approach enables efficient multi-UE communication in short TTIs, which is critical for low-latency applications.
25. The apparatus of claim 24 , wherein the instructions are executable by the processor to cause the apparatus to: receive data from the second UE during a second symbol of the two-symbol wherein the subsequent two-symbol TTI that excludes another DM-RS.
This invention relates to wireless communication systems, specifically improving data transmission efficiency in scenarios where device-to-device (D2D) communication occurs alongside cellular network operations. The problem addressed is the need to optimize data exchange between user equipment (UE) devices while minimizing overhead from reference signals, particularly demodulation reference signals (DM-RS), which are used for channel estimation but consume valuable transmission resources. The apparatus includes a processor and memory storing instructions that, when executed, enable the apparatus to manage data transmission in a two-symbol transmission time interval (TTI) framework. During a first symbol of the TTI, the apparatus receives data from a first UE, which includes a DM-RS for channel estimation. In a subsequent two-symbol TTI, the apparatus receives data from a second UE during the second symbol, but this TTI does not include a DM-RS. This approach reduces reference signal overhead by reusing channel estimation information from the first TTI, allowing more efficient data transmission in the second TTI. The apparatus may also handle data reception from multiple UEs in overlapping or adjacent TTIs, ensuring reliable communication while conserving resources. The system is designed for scenarios where UEs operate in proximity, such as in D2D communication or small-cell environments, where channel conditions may remain stable over short intervals.
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March 24, 2020
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